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A kind of preparation method of titanium alloy surface liquid diffusion aluminizing composite coating

A composite coating and titanium alloy technology, which is used in the preparation of aluminized coatings on metal surfaces and the preparation of liquid diffusion aluminized composite coatings on titanium alloy surfaces. Poor plasticity and other problems, to achieve the effect of not easy to peel and crack, improve the bonding force, and easy to operate

Active Publication Date: 2018-05-29
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, titanium alloy aluminizing technology has problems such as high aluminizing temperature, long aluminizing treatment time, and poor plasticity of the obtained coating. Lost protection

Method used

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  • A kind of preparation method of titanium alloy surface liquid diffusion aluminizing composite coating
  • A kind of preparation method of titanium alloy surface liquid diffusion aluminizing composite coating
  • A kind of preparation method of titanium alloy surface liquid diffusion aluminizing composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] test 1

[0036] After the titanium alloy sample is polished off the surface oxide layer, it is clamped on the fixture, and the fixture is fixed on the rotary table. A hydraulic system is used to drive the indenter base so that the needle roller embedded in the indenter base is pressed into the surface of the titanium alloy sample and a pressure of 76kN is maintained on the needle roller. Power equipment is used to drive the workbench to rotate at a speed of 2r / min to drive the titanium alloy sample to rotate. The needle roller rolls on the surface of the titanium alloy sample for 30 minutes to cause strong plastic deformation on the surface of the titanium alloy sample, thereby forming gradient nanocrystals on the surface of the titanium alloy sample. Floor.

[0037] The aluminum block is polished to remove the oxide layer and ultrasonically cleaned in absolute ethanol. At the same time, the surface nanosized titanium alloy sample is ultrasonically cleaned in absolute ...

Embodiment 2

[0046] test 1

[0047] The process flow and other process parameters of Experiment 1 of this embodiment are the same as those of Experiment 1 of Example 1, except that the time of aluminum expansion in the treatment of liquid aluminum expansion is 1.5 h.

[0048] test 2

[0049] The process flow and other process parameters of Experiment 2 of this embodiment are the same as those of Experiment 2 of Example 1, except that the time of aluminum expansion in the treatment of liquid aluminum expansion is 1.5 h.

[0050] Figure 4 It is the SEM image of the titanium alloy surface coating obtained in this embodiment, wherein, Figure (a) is the SEM image of the titanium alloy surface coating obtained in Test 1, wherein it can be seen that the average thickness of the diffusion reaction layer is about 650 μm, and the maximum can reach 1000 μm. The closer the alloy matrix is, the TiAl 3 The denser the phase distribution; the farther TiAl 3 The more sparse the phase distribution, it ...

Embodiment 3

[0052] test 1

[0053] The process flow and other process parameters of Experiment 1 of this embodiment are the same as those of Experiment 1 of Example 1, except that the time of aluminum expansion in the treatment of liquid aluminum expansion is 4 hours.

[0054] test 2

[0055] The process flow and other process parameters of Experiment 2 of this embodiment are the same as those of Experiment 2 of Example 1, except that the time of aluminum expansion in the treatment of liquid aluminum expansion is 4 hours.

[0056] Figure 5 It is the SEM image of the titanium alloy surface coating obtained in this example. Figure (a) is the SEM image of the titanium alloy surface coating obtained in Test 1, where it can be seen that the average thickness of the diffusion reaction layer is about 810 μm. Figure (b) is the SEM image of the titanium alloy surface coating obtained in Experiment 2, where it can be seen that only a diffusion reaction layer about 100 μm thick is formed. In add...

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Abstract

The invention discloses a preparation method for a liquid aluminizing composite coating on the surface of titanium alloy. The preparation method comprises the steps of 1, carrying out nanocrystallization treatment on the surface of a titanium alloy sample for forming a gradient nanocrystal layer on the surface of the titanium alloy sample; 2, carrying liquid aluminizing treatment on the titanium alloy sample subjected to the surface nanocrystallization treatment for obtaining the composite coating on the surface of the titanium alloy sample. The preparation method is simple and convenient to operate. Compared with traditional liquid aluminizing methods, the preparation method has the advantages that thicker coatings can be obtained at the same temperature and in the same treatment time or the coatings with the same thickness can be obtained at lower temperature and in shorter treatment time, and therefore the cost can be saved, and the formation tendency of hot cracks of the coatings can be weakened; a diffusion reaction layer of a gradient structure and staggered interfaces can be obtained on the surface of the titanium alloy, and therefore the bonding force between the coating and a base body can be greatly increased, and the coating does not peel off or get cracked easily under the effect of heat stress.

Description

technical field [0001] The invention relates to a method for preparing an aluminized coating on a metal surface, in particular to a method for preparing a liquid-state infiltrated aluminum composite coating on the surface of a titanium alloy, and belongs to the technical field of surface coatings. Background technique [0002] Titanium alloy is an important structural material, which has the characteristics of low density, high strength, good corrosion resistance, and high heat resistance. It is an important metal material used in the aerospace field. Oxidation of titanium and titanium alloys at high temperatures will lead to a decrease in strength and plasticity, resulting in surface embrittlement, which limits the use of titanium and titanium alloys as high-temperature materials. [0003] In order to improve the high temperature oxidation resistance of titanium and titanium alloys, a protective coating can be formed on the surface of the material through surface modificati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/48C23C10/02
CPCC23C10/02C23C10/48
Inventor 梅青松马烨刘明李菊英姚功铖陈峰李聪玲
Owner WUHAN UNIV
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